We covered more at Build as part of the Windows Virtual Desktop session. You can view the video here: https://www.youtube.com/watch?v=kvEjX_NOfxk Around 38:30 we cover the MSIX App Attach portions. I'd watch the blogs or twitter for any more updates as we get closer to a preview or shipping.
Application streaming is becoming a more common scenario for developers. We'll discuss how you can adjust your app to work well with remote streaming and media streaming scenarios. We'll also cover how you can use this technology to improve your testing scenarios.